使用VB.NET向android模拟器发送通知获取错误401 _android

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【使用VB.NET向android模拟器发送通知获取错误401】我正在编写VB.NET代码来向android Emulator发送通知。我可以成功从firebase控件发送测试消息。但是，当我尝试通过本地计算机中的VB.NET代码发送消息并收到错误“远程服务器返回错误：（401）未经授权”时，它失败了。
我试过看下面的链接：FCM (Firebase Cloud Messaging) Push Notification with Asp.Net并按照说明操作，但它仍然无法正常工作。
这是我的代码：

Imports System.Net Imports Newtonsoft.JsonPublic Class NotificationPublic Sub SendNotification(ByVal deviceIDList As List(Of String), ByVal title As String, ByVal bodyMsg As String)Dim fcmPath As String = "https://fcm.googleapis.com/fcm/send" Dim serverKey As String = "AIzaxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxoCAeI" Dim senderID As String = "35xxxxxxx37"Dim request As HttpWebRequest = CType(HttpWebRequest.Create(fcmPath), HttpWebRequest) With request .Method = "POST" .ContentType = "application/json" .Headers.Add(String.Format("Authorization: key={0}", serverKey)) .Headers.Add(String.Format("Sender: id={0}", senderID)) End WithUsing streamWriter = New StreamWriter(request.GetRequestStream()) Dim webObject As New WebRequestFcmData With webObject .registration_ids = deviceIDList .notification.title = title .notification.body = bodyMsg .notification.content_available = True .notification.sound = "default" .notification.priority = "high" End With Dim body = JsonConvert.SerializeObject(webObject) With streamWriter .Write(body) .Flush() .Close() End With End Using Dim httpResponse = CType(request.GetResponse(), HttpWebResponse) Using streamReader As New StreamReader(httpResponse.GetResponseStream) Dim result = streamReader.ReadToEnd End Using End Sub End ClassPublic Class WebRequestFcmData Public Property registration_ids As List(Of String) Public Property notification As New NotificationData End ClassPublic Class NotificationData Public Property body As String Public Property content_available As Boolean Public Property priority As String Public Property title As String Public Property sound As String End Class

错误发生在该行：